Calix[4]pyrrole‐based Crosslinked Polymer Networks for Highly Effective Iodine Adsorption from Water. (23rd November 2021)

• Record Type: Journal Article
• Authors: Xie, Linhuang; Zheng, Zhiye; Lin, Qiuyuan; Zhou, Huan; Ji, Xiaofan; Sessler, Jonathan L.; Wang, Hongyu
• Is Part Of: Angewandte Chemie. Volume 134:Number 1(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-23
• Subjects: adsorption -- calix[4]pyrrole -- iodine -- porous organic polymers; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202113724
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: A series of calix[4]pyrrole‐based crosslinked polymer networks designed for iodine capture is reported. These materials were prepared by Sonogashira coupling of α, α, α, α‐tetra(4‐alkynylphenyl)calix[4]pyrrole with bishalide building blocks with different electronic properties and molecular sizes. Despite their low Brunauer–Emmett–Teller surface areas, iodine vapor adsorption capacities of up to 3.38 g g −1 were seen, a finding ascribed to the presence of a large number of effective sorption sites including macrocyclic π‐rich cavities, aryl units, and alkyne groups within the material. One particular system, C[4]P‐BTP, was found to be highly effective at iodine capture from water (uptake capacity of 3.24 g g −1 from a concentrated aqueous KI/I2 solution at ambient temperature). Fast capture kinetics (kobs =7.814 g g −1 min −1 ) were seen. Flow‐through adsorption experiments revealed that C[4]P‐BTP is able to remove 93.2 % of iodine from an aqueous source phase at a flow rate of 1 mL min −1 . Abstract : A series of calix[4]pyrrole‐based crosslinked polymer networks was synthesized via Sonogashira–Hagihara polycondensation. One system, C[4]P‐BTP, was found to be highly effective for iodine capture from water with an uptake capacity of 3.24 g g −1 and quick kinetics ( k obs =7.814 g g −1 min −1 ). Flow‐through adsorption experiments revealed that C[4]P‐BTP was able to remove 93.2 % of iodine from an aqueous phase with a flow rate of 1 mL min −1 .